CN1351266A - Light guide plate and manufacture thereof, plane luminating device and liquid crystal display device - Google Patents
Light guide plate and manufacture thereof, plane luminating device and liquid crystal display device Download PDFInfo
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- CN1351266A CN1351266A CN01136864A CN01136864A CN1351266A CN 1351266 A CN1351266 A CN 1351266A CN 01136864 A CN01136864 A CN 01136864A CN 01136864 A CN01136864 A CN 01136864A CN 1351266 A CN1351266 A CN 1351266A
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- guide plate
- light guide
- light
- antireflection film
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133502—Antiglare, refractive index matching layers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133616—Front illuminating devices
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- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Laminated Bodies (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
The invention provides a photo-conductor plate serving to enhance light transmittance by reducing a reflection of light on its emission face and reflection face and a surface emitting device with this photo-conductor plate to be able to achieve efficient irradiation with light, and a liquid crystal display unit providing satisfactory contrast and excelling in displaying quality. In a liquid crystal display unit configured of a photo-conductor plate provided with a substrate having a light emission face for emitting light introduced within from a light source via a side end face and a reflection face, positioned on the other side than the light emission face for reflecting the light propagating inside, and anti-reflection films provided over a surface of the substrate, and a liquid crystal display unit arranged opposite the light emission face of the photo-conductor plate.
Description
Technical field
The present invention relates to light guide plate and manufacture method thereof, surface illuminating device and liquid crystal indicator, relate in particular to the light conducting plate structure with good light permeability of the preposition light that is used for liquid crystal indicator.
Background technology
In general, in the reflection-type liquid-crystal display device that shows as light source with surround lighting, its brightness by the luminous flux of surround lighting about, when dark local the use, under the environment that can not obtain sufficient surround lighting, exist the extremely low problem of visibility of demonstration.
For solving described problem, a kind of novel liquid crystal display device of preposition light (surface illuminating device) as secondary light source that dispose proposed in front one side of the apparent display unit of reflection-type liquid.This liquid crystal indicator with preposition light by day, be as common reflection-type liquid-crystal display device work in the environment of environmental light intensity outside the room etc., described preposition light is opened as light source is used.Fig. 8 be illustrated in liquid crystal display former configuration the cross-section structure of liquid crystal indicator of preposition light.Liquid crystal indicator 200 shown in Figure 8 is made of liquid crystal display 220 and preposition light 210, and preposition light 210 is configured in the front (Fig. 8's is top) of liquid crystal display 220, and light guide plate 212 is configured in the viewing area of liquid crystal display 220.
In the liquid crystal indicator 200 of above structure, import the inside of light guide plate 212 by the side end face 212a of light guide plate 212 from the light of light source 213 ejaculations, with light in light guide plate 212 internal transmission, on the 1st inclined plane part 216, be reflected, the 1st inclined plane part is big to the pitch angle of light conducting direction, its transmission direction is changed to exit facet 212b, and penetrate from exit facet 212b.The light that penetrates from exit facet 212b incides in the liquid crystal display 220 as illumination light, behind display circuit 226,227 and liquid crystal layer 223, on reflection horizon 225, be reflected, turn back to the outside of liquid crystal display 220, the exit facet 212b, the reflecting surface 212C that see through light guide plate arrive the observer.Like this, just the observed person is visual in the demonstration of liquid crystal display 220.
Summary of the invention
But, in the preposition light 210 of described structured liquid crystal device 200, because only on the exit facet 212b of light guide plate 212, be provided with antireflection film 215, will produce the problem that reduces contrast because of or surperficial reflection inner in light guide plate, this is caused by following reason.
At first, in described preposition light 210, incide light on the reflecting surface 212C of preposition light 210 from the outside, being reflected at this reflecting surface 212C directly arrives the observer, thereby reduced the visibility that shows.
Secondly, send side end face 212a by light guide plate 212 from light source 213 and import to light in the light guide plate 212 in the light guide plate internal transmission, by there being the 1st inclined plane part 216 at steep pitch angle that its transmission direction is changed into towards the direction that goes out outgoing plane 212b in the inclined plane part 216,217 that forms on reflecting surface 212C, wherein about 96% penetrates, illuminates reflective liquid crystal display unit 220 from exit facet 212b.But, also to have an appointment 4% by exit facet 212b reflection, become the reflected light of directive reflecting surface 212c, it injects to the outside observer of arrival by reflecting surface 212c.Such reflected light is the light that does not arrive the observer by liquid crystal display 220, and it is the light that does not have contribution to showing.Therefore, these reflected light are visual as the noise observed person, and become the reason that reduces contrast.In addition, described reflected light is to be formed by the light that reflects on the 1st inclined plane part 216 that periodically forms, and be to arrive the observer by the reflecting surface 212c that has periodically formed inclined plane part 216,217, because producing, the periodicity of inclined plane part 216,217 interferes, Moire fringe might take place.
Once more, as mentioned above, the light that sends from light source 213, changed its transmission direction by the inclined plane part 216 that forms periodically continuously on the reflecting surface 212c of light guide plate 212, from exit facet 212b outgoing, reflective liquid crystal display unit 220 throws light on.Incide the light of liquid crystal display 220, reflect to preposition light 210 1 sides, incide once more in the light guide plate 212 by the reflection horizon 225 of liquid crystal display 220.Be reflected at the exit facet 212b and the reflecting surface 212c of light guide plate 212 from the part of the light of the preposition light 210 of liquid crystal display 220 directives, generate the light that does not have contribution to showing, become the reason that reduces contrast.
In view of the foregoing, purpose of the present invention just provide reduced facial and reflect facial reflection of light, improved the light guide plate of light transmission degree in the light guide plate outgoing, have this light guide plate can the high-level efficiency irradiates light surface illuminating device, and the liquid crystal indicator that contrast is good, display performance is outstanding.
Above-mentioned problem can be solved by the light guide plate with following characteristics: light guide plate possesses matrix with exit facet and reflecting surface and the antireflection film that is arranged on this matrix surface, the exit facet outgoing imports to inner light by the side end face, reflecting surface is positioned at a side opposite with exit facet, is reflected in the light of internal transmission, and described antireflection film is arranged on described exit facet and the reflecting surface at least.
When optical wavelength 550nm, the reflectivity of described antireflection film is preferably less than 1% of A1 film reflectivity.
In optical wavelength 380nm～780nm scope, the reflectivity of described antireflection film is preferably less than 2.5% of A1 film reflectivity, and in optical wavelength 450nm～700nm scope, the reflectivity of described antireflection film is preferably less than 1.5% of A1 film reflectivity.
The refractive index of described matrix greater than 1.48, the refractive index of described antireflection film is preferably less than 1.35.
The most handy dip coating method of described antireflection film forms.
Described antireflection film is single layer structure preferably.
Above-mentioned problem can be that the surface illuminating device of feature solves by the light source that possesses the described incident end face portion that light guide plate of the present invention is arranged and be configured in this light guide plate also.
Above-mentioned problem also can be by being that the liquid crystal indicator of feature solves to possess described surface illuminating device.
Description of drawings
Fig. 1 is the sectional view of the liquid crystal indicator of an embodiment of the present invention.
Fig. 2 is with the stereographic map shown in the part amplification in liquid crystal display reflection horizon related to the present invention.
Fig. 3 A～Fig. 3 C illustrates the structural drawing of an example of antireflection film formation method related to the present invention.
Fig. 4 illustrates the test result of the film thickness distribution of the antireflection film that is recorded by AFM.
Fig. 5 shows an example of the thickness method of testing of light guide plate antireflection film.
Fig. 6 illustrates the test result of the antireflection film reflectivity of the embodiment of the invention 1.
Fig. 7 illustrates the contrast ratio test result of the liquid crystal indicator of the embodiment of the invention 2.
Fig. 8 is the sectional view that shows the example of liquid crystal indicator with existing surface illuminating device.Symbol description
1-liquid crystal indicator; 10-preposition light; 11-matrix; 12-light guide plate; 12a-side end face; 12b-exit facet; 12c-reflecting surface; 13-light source; 14-groove; 15,18-antireflection film; 16-the 1 inclined plane part; 17-the 2 inclined plane part; 20-liquid crystal display.
Embodiment
Below, with reference to description of drawings way of example of the present invention, certainly, the present invention is not limited in following embodiment.In addition, each figure of reference is for the formation of light guide plate, surface illuminating device, liquid crystal indicator is described in the present embodiment, light guide plate, surface illuminating device, the liquid crystal indicator and inequality of the size of each several part, thickness, size etc. and reality.
Fig. 1 is one embodiment of the present invention, possess the sectional view of the liquid crystal indicator of preposition light (surface illuminating device), in the figure, liquid crystal indicator 1 is made of liquid crystal display 20 and preposition light 10 substantially, preposition light 10 is configured in front one side of liquid crystal display 20, and it illuminates liquid crystal display.Preposition light 10 is made of transparent light guide plate 12 and light source 13, and light source 13 is configured in the 12a place, side end face of light guide plate 12, and light imports light guide plate 12 from side end face 12a.
The material that constitutes light guide plate 12 matrixes 11 also can use transparent resin material such as polycarbonate resinoid, epoxy resin and glass etc. except that acrylic resin.If (trade name: the JSR corporate system), this is a kind of good product, is not limited in this product certainly can to lift a tonn for a specific example.
The exit facet 12b and the liquid crystal display 20 of light guide plate 12 are oppositely arranged, and are for illuminating the light-emitting face of liquid crystal display 20, are the level and smooth face of surfaceness (Ra) less than 10nm, are provided with the antireflection film 15 that prevents the light reflection on exit facet 12b.
On reflecting surface 12c, form the groove 14 of many chock shapes that constitute by the 1st inclined plane part 16 and the 2nd inclined plane part 17, form banded, 16 couples of exit facet 12b of the 1st inclined plane part are formed slopely, in order to be reflected in the light of light guide plate 12 internal transmission, change the transmission direction of light, the 2nd inclined plane part is connected with the 1st inclined plane part, and the pitch angle that constitutes the 1st inclined plane part 16 in the 1st inclined plane part 16 of described groove 14 and the 2nd inclined plane part 17 is steeper.In addition, on reflecting surface 12c, be provided with antireflection film 18 to prevent reflection of light.
In addition, in light guide plate shown in Figure 1 12, the shape of reflecting surface 12c is the chock shape groove that forms continuously, presents the triangular wave shape, in addition, also can be between adjacent grooves 14, to be provided with and the almost parallel par platform shape of exit facet 12b shape continuously; Perhaps on reflecting surface 12c, become the shape of many depressed parts of piece continuously; Perhaps become the shape of many lug bosses of a spheroid part.
The metallic reflective coating that reflection horizon 25 is made of aluminium, silver etc. methods such as sputters forms on the organic membrane that acrylic resin constitutes, form the planarization film that is made of silicones, cover reflectance coating and organic membrane on reflectance coating, the shape of organic membrane can form concaveconvex shape on the surface for instance.This reflection horizon 25 also can form the structure that comprises the colour transition filter membrane, in this case, preferably directly forms the colour transition filter membrane above described reflectance coating.Adopt such structure,, can reduce color fringe and parallax like this, obtain high performance colored the demonstration owing on the reflection of light face, can dispose the colour transition filter membrane.
Here, with reference to Fig. 2 the organic membrane surface in reflection horizon 25 of described liquid crystal display 20 and the shape of the reflectance coating that forms are described once on organic membrane.
Fig. 2 is the stereographic map that shows after organic membrane on the reflection horizon 25 be formed on liquid crystal display 20 and reflectance coating amplify.Among this figure, form many depressed part 28a continuously on the surface of organic membrane 28, the inside of depressed part 28a becomes the part of sphere, and depressed part 28a is overlapped, and reflectance coating 29 is formed on the organic membrane 28.
Its degree of depth of depressed part 28a shown in Figure 2 forms in 0.1 μ m～3 mu m ranges at random, and the spacing of adjacent depressed part 28a is random arrangement in 5 μ m～100 mu m ranges, and the pitch angle of described depressed part 28a inner face preferably is set in-30 degree～+ 30 degree scopes.
Particularly, the pitch angle of depressed part 28a inner face be distributed in-30 degree～+ 30 degree scopes and the interval of the 28a of adjacent recessed portion for these 2 particular importances of plane omnirange random arrangement.Trace it to its cause, suppose that the interval of the 28a of adjacent recessed portion has regularity, the interference of light look will occur, produce the unfavorable condition that reflected light has color.In addition, if the inner face tilt profiles of depressed part 28a exceeds-30 degree～+ 30 degree scopes, reflection strength is just too expanded, reduced to catoptrical spread angle, (this is because catoptrical spread angle surpasses 36 when spending in air in the demonstration that can not obtain becoming clear, the reflection strength peak value of liquid crystal indicator inside reduces, the cause that loss at total reflection increases).
If the degree of depth of depressed part 28a surpasses 3 ì m in addition, when back operation planarization depressed part 28a, the flatness that can not the top of lug boss be buried, can't be obtained expecting with planarization film just.
During the interval less than 5 μ m of the 28a of adjacent recessed portion, will produce the making that is used for the duplicating type tool that organic membrane 28 forms and have restriction, extremely prolong process time, can not form the shape that obtains expecting reflection characteristic, problems such as interference light occur.In addition, for forming the employed described duplicating type tool of surface configuration of organic membrane 28, be made into duplicating type tool with parent form, its surface configuration is duplicated on silicones etc. and make again with the diamond pressure head repeatedly pushing on the base materials such as stainless steel, 30 μ m～200 μ m preferably in the point diameter practicality of diamond penetrator, the interval of adjacent depressed part 28a is preferably 5 μ m～100 μ m.
Have described shape owing to constitute the reflectance coating 29 in reflection horizon 25, liquid crystal display 20 effectively will so just can be realized bright reflection and wide visual field angle from light reflection, the scattering of outside incident.This is because the degree of depth of depressed part 28a shown in Figure 2 and interval all are controlled in the above-mentioned scope, the inner face of depressed part 28a is the cause of sphere.
That is to say that because the degree of depth of depressed part 28a and interval are all controlled, the pitch angle of the depressed part 28a inner face of Zhi Peiguang reflection angle also is controlled in certain scope, the reflection efficiency of reflectance coating 29 just can be controlled in certain scope.In addition, because depressed part 28a's is interior in the face of all directions all are the spheres of symmetry, 29 pairs of all directions of reflectance coating can obtain described reflection efficiency.In other words, no matter see the demonstration that can obtain becoming clear from that direction.
More than Gou Zao liquid crystal indicator 1 reflects the demonstration except utilizing surround lightings such as sunshine and illumination, also preposition light 10 can be opened and utilize its light to reflect demonstration.
The side end face 12a that sends by light guide plate 12 from the light source 13 of preposition light 10 imports the light of light guide plate 12 in light guide plate 12 internal transmission, by 16 reflections of the 1st inclined-plane, its transmission direction is changed to exit facet 12b one side, illuminate liquid crystal display 20 from the exit facet 12b ejaculation of light guide plate 12, inclined plane part 16 is the parts that constitute the groove 14 on the reflecting surface 12c that is formed on light guide plate 12.Incide the light of liquid crystal display 20, by the display circuit 26,27 and the liquid crystal layer 23 of liquid crystal display 20, arrive reflection horizon 25, turn back to the outside of liquid crystal display 20 by the reflectance coating reflection in reflection horizon 25, from reflecting surface 12c outgoing, arrive the observer by light guide plate 12.Like this, the demonstration observed person of liquid crystal display 20 is visual.
The exit facet 12b that has an antireflection film 15 to incident angle less than 5 degree reflection of incident light rates preferably less than 1% of the light reflectivity of A1 film, this be because, when wavelength 550nm, if the reflection of light rate surpasses 1%, the contrast that will make liquid crystal indicator 1 owing to exit facet 12b and the reflected light on the reflecting surface 12c in light guide plate 12 reduces.
The reflectivity of described antireflection film is best less than 2.5% of A1 film reflectivity in optical wavelength 380nm～780nm scope, this is because when the reflectivity of antireflection film surpasses 2.5%, become big in the deviation of visible-range reflectivity, the light of specific wavelength to be reflected, light guide plate 12 is colored and by visual.
In addition, preferably less than 1.5%, if adopt such structure, liquid crystal indicator 1 can access the white demonstration of high brightness, high color purity to the reflectivity of described antireflection film in optical wavelength 450nm～700nm scope.
The exit facet 12b and the reflecting surface 12c of light guide plate 12 are provided with antireflection film 15 and 18, to prevent to reflect the light of light guide plate inside and outside incident.Because antireflection film 15,18 is arranged, the liquid crystal indicator 1 of present embodiment can be brought into play good visibility.
At first, illustrate that liquid crystal indicator 1 shown in Figure 1 utilizes surround lighting to reflect the situation of demonstration.Because the reflecting surface 12C of liquid crystal indicator 1 outmost light guide plate 12 shown in Figure 1 is provided with antireflection film 18, the outer reflection of light rate that incides on the reflecting surface 12C just can be suppressed to above-mentioned low reflectivity like that, that is to say that it can prevent light generation strong reflection at reflecting surface 12C specific direction, thereby the visibility of the liquid crystal indicator 1 that causes descends significantly.
In addition, incide the light of light guide plate 12 by reflecting surface 12C from the outside, incide liquid crystal display 20 by exit facet 12b, owing on exit facet 12b, also be provided with antireflection film 15, as mentioned above, on exit facet 12b to the reflection of light light of wavelength 550nm less than 1%, therefore, on exit facet 12b, reflect and returning to external and the light that causes liquid crystal indicator 1 visibility to reduce has reduced.
Like this, liquid crystal indicator 1 of the present invention is owing to be provided with antireflection film on the face that light passes through, possess preposition light 10, and preposition light 10 has can reduce catoptrical light guide plate 12 on each face, the reflection that so just can effectively utilize surround lighting to have good visibility shows.
Secondly, illustrate and open the situation that preposition light 10 shows.The light that sends from light source 13 shown in Figure 1 in this case, in light guide plate 12 internal transmission, reflected by inclined plane part 16, changed transmission direction, incide in the liquid crystal display 20 by exit facet 12b, be provided with antireflection film 15 at exit facet 12b place, therefore, incide in the light of exit facet 12b exit facet 12b be reflected and by reflecting surface 12c, shining the outside, to arrive observer's light flux ratio few in the past.
Once more, incide the light of liquid crystal display 20, layer 25 reflection that are reflected, incide light guide plate 12 once more by exit facet 12b.These are by the light of exit facet 12b, because the reflectivity of antireflection film 15 less than 1%, is reflected the luminous flux that turns back to liquid crystal display 20 by exit facet 12b and also can reduce.Therefore, can prevent showing that the light that does not have contribution incides liquid crystal display 20 and becomes the reason that shows hickie.
Once more, though incide the light of light guide plate 12 from liquid crystal display 20 1 sides by exit facet 12b, arrive the observer by reflecting surface 12c, this light is when passing through reflecting surface 12C, also reflect at reflecting surface 12C, generation turns back to the light of light guide plate 12 inside, because this light also because of the antireflection film 18 that forms on reflecting surface 12C reduces, can prevent from the inside that demonstration does not have the light of contribution to remain in preposition light 10 or liquid crystal display 20 is become the reason that reduces visibility.
Like this, no matter liquid crystal indicator 1 of the present invention is still opened preposition light 10 in the situation of utilizing surround lighting to reflect demonstration and is reflected under the situation of demonstration, can both obtain the outstanding high-performance of visibility and show.
The antireflection film 15,18 of described light guide plate 12 can form with the dip coating method, and an example that forms antireflection film once with the dip coating method is described below with reference to Fig. 3.Fig. 3 shows that the present invention forms the engineering drawing of an example of antireflection film, and Fig. 3 A～C is the engineering order.
At first,, on the side end face of matrix 30 30a, 30b, set the masking material 31a, the 31b that form by three amyl acetates etc. respectively, antireflection film is not formed on the 30a of side end face if shown in Fig. 3 A.Matrix 30 is made by resin material injection molding formings such as transparent acrylic resin, polycarbonate, on a face of matrix 30, form many banded chock shape grooves 32 that are, the one side (in figure do not demonstrate) opposite with forming groove 32 then is smooth face, in addition, side end face 30a also is smooth face.
Secondly, shown in Fig. 3 B, one side is being supported an end of matrix 30, and one side imports to matrix 30 in the container 34 that is full of resin solution 33, to form antireflection film.The state that this matrix 30 all is immersed in the resin solution 33 is kept about 1 minute～5 minutes.Resin solution 33 does not have specific restriction, for instance saitoltupu (trade name: the Asahi Glass corporate system) be useful solution.
Once more, shown in Fig. 3 C, the speed of matrix 30 with 150mm/min～300mm/min is promoted upward, in promoting engineering, preferably make direction of improvement have the length direction of chock shape groove 32 to parallel with matrix 30 banded generations.This is that resin solution 33 just rests on the lug boss of 32 of adjacent trenches because if make when the length direction of groove 32 is vertical with direction of improvement to be promoted, and the antireflection film thickness of formation is just inhomogeneous.
Fig. 4 illustrates such change direction of improvement and makes when forming the antireflection film light guide plate, measures the test result of antireflection film thickness with AFM (Atomic Force Microscopy).In addition, the measurement of described AFM is that the probe 36 with AFM scans near the summit of the lug boss 35 that forms between matrix 30 adjacent grooves 32, and Fig. 5 illustrates its fragmentary cross-sectional view.
The shape of matrix 30 lug bosses 35 when the curve that shows with solid line among Fig. 4 illustrates and do not form antireflection film.The curve that shows with a dot-and-dash line among Fig. 4 is the test result of the antireflection film that forms when direction of improvement is parallel from resin solution 33 of length direction matrix 30 when forming antireflection film of groove 32, and the curve that two dot-and-dash lines show is the test result of the length direction of groove 32 antireflection film of formation when vertical with direction of improvement.Poor from curve shown in a dot-and-dash line, two dot-and-dash lines and the solid line can demonstrate the thickness of the antireflection film that forms on the matrix 30.
As shown in the figure, being parallel to direction of improvement with the length direction of groove 32, to compare the thickness of the antireflection film that forms when the length direction of (dot-and-dash line) direction of improvement and groove 32 is vertical to form antireflection film (two dot-and-dash lines) thicker all over, inclined plane part is thick especially near the summit of lug boss 35, and homogeneity is fine.
Once more, it is dry to put in the baking oven that is heated to about 70 ℃～90 ℃ the universe through the matrix 30 that described engineering has applied resin solution 33, and like this, the resin solution 33 that is coated in matrix 30 surfaces is dry by the universe, solidify, and forms antireflection film thus.Then, remove masking material 31a, 31b, obtain to have formed on the face except that matrix 30 side end face 30a the light guide plate of antireflection film.
Adopt described manufacture method,, also can form the antireflection film as thin as a wafer about uniform 0.1 μ m even formed on the such face that concaveconvex shape is arranged of the face of chock shape groove 32 at as shown in Figure 3A matrix 30.Therefore, adopt described manufacture method,, just can make the light guide plate that possesses outstanding light transmission owing to can on a plurality of of matrix, antireflection film be set.In addition, owing to can form described antireflection film simultaneously on a plurality of, the manufacturing cost of light guide plate can be oversimplified, can be reduced to manufacturing engineering.
In addition, if adopt described manufacture method, antireflection film can adopt single layer structure, and this is because antireflection film related to the present invention has the equal above light transmission of antireflection film that constituted with multilayer with the past.In other words, because the antireflection film that forms with infusion process as thin as a wafer and evenly, can be brought into play outstanding light transmission.But sandwich construction is effective certainly in some cases, adopts under the situation of sandwich construction, adopts described manufacture method also can to form evenly and layer as thin as a wafer by lamination.
In addition, make light guide plate if adopt described manufacture method, when constituting preposition light and being configured to the front of liquid crystal display with this light guide plate, because described light guide plate has outstanding light transmission, the demonstration of liquid crystal display that sees through light guide plate is good, and, just can provide the liquid crystal indicator that possesses good visibility because described preposition light can effectively illuminate liquid crystal display.
Specific embodiment
At first, with a tonn (trade name: the JSR corporate system), make material, make matrix, on a face of matrix, be the banded groove that forms many chock shapes with injection moulding method.It is reflecting surface that chock shape groove one side is arranged in this matrix, and the face of an opposite side with reflecting surface is an exit facet, and the refractive index of this matrix is 1.52.
Secondly, place, side end face in described light guide plate sets masking material, processing is sheltered in the side end face, this matrix is immersed in saitoltupu (trade name: the Asahi Glass corporate system), speed with 210mm/min promotes, applies described solution, then with this matrix dry 1 hour of universe in being heated to 90 ℃ baking oven, on the surface of described matrix, form thickness 0.1 μ m antireflection film, make light guide plate, the refractive index of light guide plate antireflection film is 1.34.
Once more, remove the masking material of light guide plate side end face after, set light source in the side end face of light guide plate and constitute preposition light with White LED, the front that this preposition light is provided in the reflective liquid crystal display unit makes liquid crystal indicator.
The preposition light of described liquid crystal indicator is in non-illumination condition, incident angle 30 degree of liquid crystal display, viewing angle is under the 0 degree situation, has measured from the reflected light of the liquid crystal display reflectivity during by light guide plate with LCD-7000 (trade name: Da mound electronics corporation system).From these results, with likening to of reflectivity under the black demonstration situation of liquid crystal display and under the demonstration situation in vain is contrast ratio.Testing as can be known by these, contrast ratio of the liquid crystal indicator of present embodiment is 13.
Once more, from the exit facet one side irradiates light of light guide plate, measure its reflectivity with optical splitter, measurement result is shown in Fig. 6.In the figure, transverse axis illustrates light wavelength, the longitudinal axis illustrates and the corresponding reflectivity of transverse axis wavelength light, and still, the reflectivity of the longitudinal axis is the reflectivity of the reflectivity with the A1 film when being benchmark, with % than expression.As shown in Figure 6, the reflectivity of the antireflection film of the light guide plate of present embodiment when optical wavelength 550nm less than 1% of A1 film reflectivity, in wavelength 380nm～780nm scope less than 2.5% of A1 film reflectivity.In addition, in wavelength 500nm～700nm scope less than 1% of A1 film reflectivity, in wavelength 450nm～700nm scope less than 1.5% of A1 film reflectivity.
Once more, on with the base material that method makes similarly to Example 1, form in the engineering of antireflection film, employing flashes to film method, by changing over the combination of membrane material, thickness, the antireflection film reflectivity that is respectively formed at wavelength 550nm is respectively the antireflection film of A1 film reflectivity 0.6%, 0.9%, 1.45%, 2.3%, 4.3%, makes light guide plate.Described light guide plate with 4.3% reflectivity is the light guide plate that does not form antireflection film.Then, with these light guide plate and the described embodiment 1 the same liquid crystal indicator of having made.
With BM5 (trade name: the topukonn corporate system) tested the contrast ratio of these liquid crystal indicators, test result is shown in Fig. 7, in the curve shown in this figure, transverse axis is represented the reflectivity of antireflection film, and the longitudinal axis represents to possess the contrast ratio of the liquid crystal indicator of different light guide plate.This contrast ratio is to measure at liquid crystal indicator under the black demonstration situation of liquid crystal display under the preposition optical illumination state and under the white demonstration situation to obtain their ratio in the brightness of normal direction.
If shown in 7, if the reflectivity of antireflection film is less than 1% when optical wavelength 550nm, the contrast ratio of liquid crystal indicator is up to more than 7.7, and reflectivity surpasses 1%, and contrast ratio just reduces gradually, and contrast ratio is reduced to 5 when reflectivity 4.3%.In other words, if the reflectivity of antireflection film is less than 1% of the A1 film, in the time of just preventing to arrive the observer because of the reflected light that comes from liquid crystal display by light guide plate, the demonstration hickie that the light that reflection produces on exit facet causes etc. improve the contrast ratio of liquid crystal indicator.Comparative example 1
Once more, as a comparative example 1, on the side end face of the matrix of making of injection moulding method and reflecting surface, set masking material and form antireflection film, except only forming on the exit facet the antireflection film, make the liquid crystal indicator the same with described embodiment 1.
Described liquid crystal indicator shows under the bright state of preposition illumination, uses with the same method of described embodiment 1 and measures contrast, and contrast is 8.Comparative example 2
Once more, as a comparative example 2, adopt commercially available antireflective film to make light guide plate.
At first use acrylic resin derupeltuto (trade name: Asahi Chemical Industry's corporate system) carry out injection molding forming, make matrix, on face of matrix, form banded chock shape groove as material.It is reflecting surface that the face of most those sides of chock shape groove is arranged on this matrix, and the face of an opposite side with reflecting surface is an exit facet, and the refractive index of this matrix is 1.49.
Once more, on the exit facet of described matrix, stick antireflective film and make light guide plate.Antireflective film employing refractive index is 1.38 commercially available product.
Once more, on the side end face of this light guide plate, set the light source that possesses White LED and constitute preposition light, preposition light is configured in the front of reflective liquid crystal display unit, make liquid crystal indicator.
Make bright demonstration of preposition illumination of described liquid crystal indicator, with the described embodiment 1 same contrast of measuring, the result is 8.
Can confirm from described embodiment 1 and comparative example 1, comparative example 2: adopt of the present inventionly all to be provided with the light guide plate of antireflection film, constitute the liquid crystal indicator that possesses preposition light and can obtain outstanding contrast at exit facet and reflecting surface.
Describe in detail as top, because light guide plate of the present invention constitutes by the matrix with exit facet, reflecting surface with at the antireflection film of this matrix surface setting, antireflection film is arranged on described exit facet and the reflecting surface at least, therefore, can be suppressed at exit facet and reflecting surface place inside or outside reflection of incident light, bring into play outstanding light transmission from light guide plate.
Also have, if the reflectivity of light guide plate antireflection film related to the present invention when optical wavelength 550nm less than 1% of A1 film reflectivity, light guide plate has outstanding light transmission, in the liquid crystal indicator that this light guide plate is placed on the front, shows, can prevent that the contrast ratio that shows from reducing through this light guide plate.
In addition, if the reflectivity of optical wavelength described antireflection film in 380nm～780nm scope, can suppress the coloring phenomenon that light that strong reflection because of certain wavelengths light sees through light guide plate causes less than 2.5% of A1 film reflectivity.
In addition, if optical wavelength is in 450nm～700nm scope, the reflectivity of described antireflection film can be all consistent in very wide wavelength coverage by the light intensity of light guide plate less than 1.5% of A1 film reflectivity, can access high brightness, the demonstration of high color purity.
Once more, if the refractive index of matrix related to the present invention is greater than 1.48, and the refractive index of described antireflection film because can be closed in the light guide plate at the light of light guide plate internal transmission, thereby can suppress the loss of light, the efficient of raising light source less than 1.35.
Once more, if the antireflection film of the light guide plate that the present invention is correlated with adopts single layer structure, antireflection film simple in structure can reduce manufacturing cost.
Particularly, if adopt the dip coating method to form the antireflection film of light guide plate related to the present invention, because on the reflecting surface of the light guide plate that has formed concaveconvex shapes such as groove, also formed antireflection film, therefore, can further significantly improve the light transmission of light guide plate.
Also have, method for manufacturing light guide plate of the present invention comprises following engineering: after being immersed in the tabular matrix that has formed the chock shape groove that is banded on the face in the resin solution that contains the resin material that can constitute antireflection film, this matrix is promoted from resin solution, thereby apply the engineering of described resin solution; With make this matrix drying, on matrix surface, form the engineering of antireflection film.Because the direction that described matrix promotes from resin solution is parallel with the direction of described matrix groove, has formed at matrix on the face of groove and also can form uniform antireflection film.In addition, because can on described matrix, once form a plurality of antireflection film,, reduce manufacturing cost so can make engineering simplification.
The light source that surface illuminating device of the present invention possesses light guide plate of the present invention and disposes in this light guide plate side end face also has, owing to can obtain high efficiency illumination because of the outstanding light transmission of light guide plate.
In addition, liquid crystal indicator of the present invention is owing to possess surface illuminating device of the present invention, can be with the high efficiency illumination that is used for liquid crystal display of the light of surface illuminating device light source, meanwhile, because the light transmission of light guide plate excellence, when showing, can prevent to show the decline of contrast ratio through surface illuminating device.
Claims (18)
1. light guide plate, it possesses matrix and is located at the antireflection film of matrix surface, and matrix has exit facet and reflecting surface, the exit facet outgoing imports inner light by the side end face, reflecting surface is positioned at a side opposite with exit facet, and it will is characterized in that in the light reflection of internal transmission:
Described antireflection film is located on described exit facet and the reflecting surface at least.
2. light guide plate according to claim 1 is characterized in that:
On described reflecting surface, be provided with a plurality of inclined plane parts to be reflected in the light of described matrix internal transmission, change the transmission direction of this light.
3. light guide plate according to claim 1 is characterized in that:
The reflectivity of described antireflection film when optical wavelength 550nm less than 1% of A1 film reflectivity.
4. light guide plate according to claim 3 is characterized in that:
The reflectivity of described antireflection film in optical wavelength 380nm～780nm scope less than 2.5% of A1 film reflectivity.
5. according to the described light guide plate of claim 4, it is characterized in that:
The reflectivity of described antireflection film in optical wavelength 450nm～700nm scope less than 1.5% of A1 film reflectivity.
6. light guide plate according to claim 1 is characterized in that:
The refractive index of described matrix is greater than 1.48, and the refractive index of described antireflection film is less than 1.35.
7. light guide plate according to claim 1 is characterized in that:
Described antireflection film adopts the dip coating method to form.
8. light guide plate according to claim 7 is characterized in that:
Described antireflection film is a single layer structure.
9. method for manufacturing light guide plate, comprise the engineering that substrate resin solution coating engineering and this matrix surface form antireflection film, resin solution coating engineering is with after being tabular matrix that band shape formed a plurality of chock shape grooves being impregnated in the resin solution that contains the resin material that can form antireflection film on a face, and this matrix is mentioned from described resin solution; It is that the dry back of the described matrix universe is formed antireflection film on the surface of this matrix that antireflection film forms engineering; It is characterized in that:
Described matrix is parallel with the length direction of described matrix groove from the direction that resin solution promotes.
10. surface illuminating device is characterized in that:
It possesses light guide plate according to claim 1 and is provided in the light source of this light guide plate incident end face portion.
11. surface illuminating device according to claim 10 is characterized in that:
On the described reflecting surface of described light guide plate, be provided with a plurality of inclined plane parts, with the light that reflects described matrix internal transmission, the transmission direction that changes this light.
12. surface illuminating device according to claim 10 is characterized in that:
At the reflectivity of antireflection film described in the described light guide plate when optical wavelength is 550nm, less than 1% of A1 film reflectivity.
13. surface illuminating device according to claim 12 is characterized in that:
At the reflectivity of antireflection film described in the described light guide plate in optical wavelength 380nm～780nm scope, less than 2.5% of A1 film reflectivity.
14. surface illuminating device according to claim 13 is characterized in that:
At the reflectivity of antireflection film described in the described light guide plate in optical wavelength is 450nm～700nm scope, less than 1.5% of A1 film reflectivity.
15. surface illuminating device according to claim 10 is characterized in that:
Greater than 1.48, and the refractive index of described antireflection film is less than 1.35 in the refractive index of matrix described in the described light guide plate.
16. surface illuminating device according to claim 10 is characterized in that:
Form with the dip coating method at antireflection film described in the described light guide plate.
17. surface illuminating device according to claim 16, its spy is:
At antireflection film described in the described light guide plate is single layer structure.
18. a liquid crystal indicator is characterized in that:
Possesses the described surface illuminating device of claim 10.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000333766A JP2002139630A (en) | 2000-10-31 | 2000-10-31 | Light transmission plate, method for manufacturing the same, surface light-emitting device and liquid crystal display |
| JP333766/2000 | 2000-10-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1351266A true CN1351266A (en) | 2002-05-29 |
| CN1167958C CN1167958C (en) | 2004-09-22 |
Family
ID=18809795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011368640A Expired - Fee Related CN1167958C (en) | 2000-10-31 | 2001-10-31 | Light guide plate and manufacture thereof, plane luminating device and liquid crystal display device |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US6693683B2 (en) |
| JP (1) | JP2002139630A (en) |
| CN (1) | CN1167958C (en) |
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| CN100437152C (en) * | 2004-09-30 | 2008-11-26 | 亚洲光学股份有限公司 | Coating method of wet type anti-reflective compound film |
| CN100458275C (en) * | 2002-11-29 | 2009-02-04 | 富士通株式会社 | Illumination device and liquid crystal display device |
| CN108020882A (en) * | 2017-12-15 | 2018-05-11 | 深圳市华星光电技术有限公司 | Light guide plate and its manufacture method, backlight module |
| CN112731583A (en) * | 2021-02-09 | 2021-04-30 | 捷开通讯(深圳)有限公司 | Front light guide module |
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| JP4077182B2 (en) * | 2001-10-11 | 2008-04-16 | 株式会社日立製作所 | Liquid crystal display |
| JP2003344850A (en) * | 2002-05-17 | 2003-12-03 | Koninkl Philips Electronics Nv | Liquid crystal display device and surface illumination device for use in the same |
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| US20040257484A1 (en) * | 2003-06-18 | 2004-12-23 | Alps Electric Co., Ltd. | Illumination device, tablet, and liquid crystal display |
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| JP2005338486A (en) * | 2004-05-27 | 2005-12-08 | Alps Electric Co Ltd | Antireflection structure, antireflection film equipped therewith, light guiding material, illuminator and liquid crystal display |
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- 2001-10-31 CN CNB011368640A patent/CN1167958C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458275C (en) * | 2002-11-29 | 2009-02-04 | 富士通株式会社 | Illumination device and liquid crystal display device |
| CN100437152C (en) * | 2004-09-30 | 2008-11-26 | 亚洲光学股份有限公司 | Coating method of wet type anti-reflective compound film |
| CN108020882A (en) * | 2017-12-15 | 2018-05-11 | 深圳市华星光电技术有限公司 | Light guide plate and its manufacture method, backlight module |
| CN112731583A (en) * | 2021-02-09 | 2021-04-30 | 捷开通讯(深圳)有限公司 | Front light guide module |
| CN112731583B (en) * | 2021-02-09 | 2022-09-02 | 捷开通讯(深圳)有限公司 | Front light guide module |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002139630A (en) | 2002-05-17 |
| CN1167958C (en) | 2004-09-22 |
| US20020057399A1 (en) | 2002-05-16 |
| US6693683B2 (en) | 2004-02-17 |
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